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Bcr scientific method power point

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Bcr scientific method power point

  1. 1. A set of steps used by scientists as they conduct research
  2. 2. Observations <ul><li>The process of obtaining information by using the senses </li></ul><ul><li>This is when you look at what is around you and take note </li></ul>
  3. 3. Problem <ul><li>The question you are trying to answer </li></ul><ul><li>A question raised for consideration or solution. </li></ul>
  4. 4. Hypothesis <ul><li>An educated guess </li></ul><ul><li>Predict the answer to the problem </li></ul><ul><li>Phrased “If…then…” </li></ul><ul><ul><li>(Example: If the plants are exposed to sunlight then they will grow.) </li></ul></ul>
  5. 5. Experiment <ul><li>A procedure to test the hypothesis. </li></ul>
  6. 6. Experiment continued: Variables - factors that can change <ul><li>Manipulating/ independent variable  variable that is deliberately changed </li></ul><ul><ul><li>Or the one you have control over </li></ul></ul><ul><li>Responding/ dependent variable  variable that is observed and that changes in response to the manipulated variable </li></ul><ul><ul><li>This is what you are measuring </li></ul></ul><ul><li>Controlled variables  variables that remain the same in all the experiments </li></ul>
  7. 7. Experiment continued: Control Group <ul><li>The control group acts as a reference point or measuring stick to compare with the variable group. Any difference between the two groups can only be due to the one experimental factor that is being tested. </li></ul>
  8. 8. Data <ul><li>Results of the experiment. Can be: </li></ul><ul><ul><li>Quantitative – numerical in nature (think “quantity”; ex: 5 cm, 9 seconds) </li></ul></ul><ul><ul><li>Qualitative – descriptive in nature (ex: color changes, odors, other observations made by senses) </li></ul></ul>
  9. 9. Data Reporting <ul><li>Data can be reported both in narrative form and through diagrams, tables and graphs. </li></ul>
  10. 10. Conclusion <ul><li>The answer to the hypothesis, once it has been tested is often called a “theory”. </li></ul>
  11. 11. Retest <ul><li>In order to verify the results, experiments must be repeatable . </li></ul><ul><li>If they cannot be produced through repeating the experiment again, then they are not valid. </li></ul>
  12. 12. Got it? <ul><li>Let’s see… </li></ul>
  13. 13. For example… <ul><li>Let’s say I wanted to see whether Miracle Grow or cow manure would make my tomato plants produce the largest tomatoes. (On a piece of paper, jot down your answers to these questions.) </li></ul><ul><li>What would be my independent variable? </li></ul><ul><li>What would be my dependent variable? </li></ul><ul><li>What would be my controlled variables? </li></ul><ul><li>What would be my control group? </li></ul>
  14. 14. Tomato Experiment – answers ! <ul><li>What would be my independent variable? </li></ul><ul><ul><li>Variable you are changing = type of fertilizer </li></ul></ul><ul><li>What would be my dependent variable? </li></ul><ul><ul><li>Variable you are measuring = size of tomatoes </li></ul></ul><ul><li>What would be my controlled variables? </li></ul><ul><ul><li>Everything same for the two plants: soil, sunlight, water, etc. </li></ul></ul><ul><li>What would be my control group? </li></ul><ul><ul><li>A tomato plant grown in the same conditions without any fertilizer </li></ul></ul>

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